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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da660089a848339cfaf0f77c6eaa62a38aebce5ead0cb4655eabd6cd54a02a89' 
  AND token = 'gw1pJA5mULvlAY4gYnORrldOVnn57THnhPT8l5ZS7nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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