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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09569a3111a9def6fcc61555ad662b6d801e4c4015ee7cc75f393ac9feed14ec' 
  AND token = 'g3oAH5mTuY6aSBbfoLDHsOTxKU8etFW+OnAlPflrTmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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