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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0521a99c046a9558d494ab86448faa662c8922bebe3c4b34a5eb1ce1dedecc67' 
  AND token = 'YDM/EKzKXN5q5/lVZbdHqpAerhpttswL5tnaDo0aW7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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