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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb30c4939dc958b1db6e6a121b1d100388a9af5807f891141a33a36e0285f09' 
  AND token = 'OseJ9KRFPXN3rJoKzs1U/d4XpdYsjRmQegICBok/yAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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