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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afa9a5d929cb8c54a42c87589c15e60b7c705ae40dd42c3c2df69eaad8bdebb' 
  AND token = 'Pq3PqC6q6SDcHsiO5flUUjY/jNr8ZlZp/tc2wzsoIuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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