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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5ba2df2dc494ab254c3e065a6e9b87ca15853b3d6b10727b0e7d699c79ba5d' 
  AND token = 'SRPJh/SEOQI0i230JIn/lmfzIPJLYc6Qq4gQGrcdRHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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