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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a5cce75d726a860ce46ab83a99ee25d8bbd6cd6a9bec23a307f41f7e342e89' 
  AND token = '6GRkWaI1y1fH/ZB5XjT4Hcpru2BK3S7M58SUKDRFsGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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