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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54690457a33fedca9f2b4f8fdabfa2640bcbb5a5b810c374d567aeb6fab5f58' 
  AND token = 'yvGeUOECCxIE/6aoDmYOUera6cqo1fsuIcYldsfY4SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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