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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5038fa2bb6ba98df6b16bff020e071755c79eaeb4f74ac3e2fe44309cf17fc' 
  AND token = 'zB1ZJWO3dFssxRqQvTBX3MjIQKpVdOMMtIB9Vbzn5BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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