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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889fba2a68776f079789102631182c93fa6f6982fa95bf1f89940aa478c9082f' 
  AND token = 'RzlvPhDteHSIq9RFRntHBd+JwEdaReEsGko/j+iPdCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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