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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede990393d379a75edd2fbe3b629cbc27da730015d24a8c7b5db39c6be1723eb' 
  AND token = '4TZ99aqQQ3+iG/fUbB7dhEzzhtaFS+BaghqoiRrb3pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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