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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62bb4f54c0e35570cce50b6c2eca6eae78fe465e436d164adcd889b78c451bb' 
  AND token = 'a7p0GJuxdlVB4jPNF1QVTTioDhGQNsRSdKuAmFNEfi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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