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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b2752ca0882cb8f0f2c828b5d937a2a514364b35f04e5022f2b44a7ed9224f' 
  AND token = '/RYCliHAp+Yi/NOPFmKsGL0tiMNbvdqeDlctiOc2SGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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