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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa1f71bd570493c16421f97833a081ac2b1f655cf15da54ad43390eecc68c77' 
  AND token = 'IbsZMKCEPWhrX3OQRyxQrBm4ZpbBLByy+ejxIge86KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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