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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2535bd6c308cea518248b7893f5fd86785e71612e9c8436e593b57f25bcfa1' 
  AND token = '3i5oCngo9KmGBApMmX2guuSEb8IyB8VUkMWIyuE86MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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