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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b2acabbc81d8bf44a1aed7457c0faef5b92dd61b5d31df7506aaa09b58d294' 
  AND token = '3RfCpHCZ4t1/mtaNw3C4MhenGNSsFLSUHxwRjTtQoC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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