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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2f979796995dcaeaf5937a14d515e26382a89d21e0abb377bcd5f97122f334' 
  AND token = 'fdfWtEUsb+zrpClKBdqbTfi2if9K5ebFDm51AY1Y/hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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