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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737ed5817c6668445e1caf6682cd44c91aab48e40fef282760906b8d7a303e1e' 
  AND token = 'mIpRhhLf45UxqE8gT7ZRe0LWw7UvcspzXgx8+erYANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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