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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f471180965b7b26b08d408356119cbd5596b025d010f4ea5966f6e145bf7de6f' 
  AND token = 'FAn5tsWtHzSTZlp9kTeHpqR18IEkYpMPsvtNVlWR0n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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