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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991990babb01dd5ab4fd9245985f1d3038100c290679bb05a0da1836b3fac9d5' 
  AND token = 'KuKlFPTPuX3yFM0Iz8OtJyZkUTXop81liCst9piGsJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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