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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f4d96ccd00e10c0932c9036b7a4ea77b3c6df228b583322b715ee9be671a5e' 
  AND token = 'VCQEyXwXDPdNB9PfgGje9YFkeDMp2Q/9aLu+fNfcb7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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