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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7052dd79f2d980677a9f9784826874c6e943d4b3d977542693cbcb7bfe5ef3' 
  AND token = 'zF/Mcf8Hts7+MCe2J44AIFUqRd3vjm340iDHzJM+dbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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