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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4416f2ee8a45853bacdaed85b7edd735345b9848d0740e330b2cb90da5408a38' 
  AND token = 'mZA84+szhfUXaYoqB9yT1XADy2S/uIVSfu88C+V01Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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