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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff764f9f382855e30c714a397caf19bfc92fc531e032a1c5d8a7166808f76c8' 
  AND token = '3m74Rb5a5pHeC7Ddbcd22H/DoGAcKVlIZFbpHZH3WeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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