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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89b9c0bd7f13a9a89ccb934e972fe97990150905a7c5d9bf5227588ca3ba6e9' 
  AND token = '31BbfL36IHn1qK6fjjAMqJy9NtRlKwshMWLAt9FR4zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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