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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f755aa7f4b3ee53edc4237eb691979e76e3c9e5ee1df87c6ac15a891c923b64' 
  AND token = 'bciL2grqGqxgYKfdcJhA7dsfvHXL2R7XaZxlHMuQwWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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