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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a44f04f1f7f55e10dff1667f43cba1e67b1ec52e2f1a42d0c7e46f5719cb193' 
  AND token = '0Gbc4RR+vyd2y1bbHc6KeqLIazTMNd5Uc+37JD1Dalc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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