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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fd08a6ff396f0f735195d0fc9930e8de2014ff186536297c619410f4d15d23' 
  AND token = 'BkfTkA/RuVHBHTvep0KLndUyAs0CSBcqals98OpPJBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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