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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9f23e15fd99d175cb3c4c433a2159ab633116c2036eb793898cf9a87bda790' 
  AND token = 'IY6vDfQrNk6fJbpnhSwEKYf47EjiKWhWM2br+K7R7sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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