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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc63b7f96e34946affc342aeca2ec30c522f57652db99a52b0d477ff5be1804' 
  AND token = 'Wvzo2ktxQ7x9e6lakxXCziCbVQPZxkCdFpkYkHec82g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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