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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da53e4af7afcd1ad3f829ed2e6b8a114aefb09fed1000d2f95be2ad4974e0eb' 
  AND token = 'AaPTOr4dKKdCxEiDxwlwlws5sza6OuIM3gK6S70gQh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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