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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ea724c7ab59d4c6ab4a89de0854a726061c82ef63a3ab7a1b78f5a279b12ea' 
  AND token = 'WsYKnC08D7LF4ZmYdqKmhcqucEooMr723LmraBzdggc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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