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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367a640bb301d3c5b98f016b20f78fefd2854386d6ed1bd1985659273a44e944' 
  AND token = 'zj1BqX7iUlTe75TE05XBAaRxHjkbFNn11ooV+YN0eRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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