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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78adff94093aee9aace6762a163d843417a6b0b6713064c7f5beeb21e6a70dbd' 
  AND token = 'RpbpHaPc5VtWEtAdyiVeMmVTNx4FTGPkKtZBYqaG15M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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