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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798bf625341fdc3f9195469ad98232f3ee54f87ed49d98c2b1f4b0f0724e68cf' 
  AND token = 'lH9H+Q6REGlfWqTKbI9gDpzhorKecIJ4lWbkQiLPCD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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