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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757b53da57f10072162ee15387229142b06e762d5cf860da87eb0bb5f004f660' 
  AND token = '6dYHgn37ykW7/iAw6xO2hH3Sfc1KiWne4aODtX+KsEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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