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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0020c23205f1068f7c80a847e7ffb1792b8766454e5e0fde4a865d7c2a1419' 
  AND token = '7q18maHW9r005a8AgT+4oHRDiV6/PJZ+WPUOYDUTSYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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