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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd27448d8ffb920ebfe43a58300e5da4f04e6264e8ea1c259b1cc76e00937e0' 
  AND token = '++QZbuD+0ATHUlPt3wFRaqTivcl4SHimAxovcKGezEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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