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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c600be230219a4f07095206a41cb522f95c543e40323f502d3d8557675224c0c' 
  AND token = 'hDHERd1M48RZdTbDoHceZtnFWNCqyNCHp1GtEdGNHzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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