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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d016ac33415b42b48e5f61bad9148cdb11978a0a1413d705b832e9deba7f1d0' 
  AND token = 'UIqy+KJBP6Evc2tkz3FENs4S5YMcRGbiChYJ+B0rKso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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