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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d84fc2695bb0a82e9b33e59d50a544d039495d46255e72b620fcbab8cdde899' 
  AND token = 'r8SkPw4Ceo53vFj1rZfw2USknuPC61MaNJwj69F1sGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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