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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0d85d6a925b9d20e9f86308b4b00849ecf784d9fb9bb013973519dd7ee902d' 
  AND token = 's6myYv9HUoz2U3SKrd+QwiPb6mcWH45WMta46Fb6spo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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