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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7922b30de595c4ebd2a2edce505be20845529d5fd7a80f7510bf56c02431aec' 
  AND token = '4ptQHvHJneJ3VyrwBaGq4xBPlceQIC1p8bnJzyml5Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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