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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ea3a16b7283d4e4e7070d073160aad28e2208509d58e5f7a1ef9a89b63ea06' 
  AND token = '8t9/qFsBTtWT9ktfnKcaWhZXgALvSX/yLt8kkhhe44g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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