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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a82c450345940112c6640d9a484210435c260baf38b4b666cc82603608e0577' 
  AND token = 't0xZ+b3MXqeitl7koppJHV8ldLSok+WJjZYbnxAXKR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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