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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825a451cc7b84af9c8df88d947fe8fd617e0cc4700c038fcd40047daff00e049' 
  AND token = 'wQqxCgDxotdRQTqt7nO2BnErKsrfx8UGFcH6MLms7Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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