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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8071627a8cffeb6b2c8204ba665cc5b89450e9db2b4f9e9539cac7feea40ea1a' 
  AND token = '3ViZMMUYF3oHeFAy5uSps+OXZNar7B83h1qzYBIEkiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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