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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccfe97622c0d2b71f59a731928ace07fcdaa042146016602f2c77a0fa55ea5e' 
  AND token = '6OuqYd9/D4QyKs9lfkdJlETmjSxJYi9CpKtYio9qwpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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