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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb915fda7c4cf6d8eef41c32217801b7964fc55316569a7b5f1cc5d02fb68c2' 
  AND token = 'potrGTB70BAi7Ey1lhHsHtI4PV5/RSpuZ7ItBMiGMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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