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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cbfc6decf9dc371dacf297edf06d752b9c68c9f614b1fa33ca2ded41ee3295' 
  AND token = 'dPvYWn/lnBFwqZhwygu1QEv8Ok32XecpZlGuTxOb3GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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