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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8739184317961dd53d43c667228defeeb4c46629ac828a67fc1a6f0bdc628b46' 
  AND token = '3jcR9STZDSl1P4q61909xO14T5BlqJ994lbJrQStlIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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