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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37eab9b00d837818f7b0044acab4363cf67ef9705e011c2a17522846b030c5f1' 
  AND token = 'v7V6ip+QdARTLeCoVbLn6Cf+juogmC/3rGUoxia0IIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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