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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98f53e61123d3e9e9c807896f9dfa41acebb51a91988ae0aa745cef4bc2f5c5' 
  AND token = 'QrC09fkV45sKU7uyQxz/S4mponwQSn6MnUUeYzpzt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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