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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9451aa1c7461e99f630a61f6fda694143ea0618e7f512f8e17c7ace91d3700d' 
  AND token = 'sXBJZY1hL/7KQ9TkmwT+kdas9RPmO7Bf27au8q42svQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}