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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190b238da893cef3a5a2f184e3c7a067a763e1d6c815516784cc1fe8bfe6876d' 
  AND token = 'wrN/BzrmA1EmH+sa8cajGdRiTTKCuXGH+bvZ515ej88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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