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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb046421ac7325c6381c74f97f8056f69cb5dadb209d481d135c0af51849d58' 
  AND token = 'Ct3oSUik0FHR0GHmVJehTUWsHGz/YdsbTX9u7SVyx9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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