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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119b112c28d4f4a1cc3507888a6b9ced37f1a16170f7f85f1189bb52ce7facf3' 
  AND token = '2JXtqjFXqpRg3u4KzldvmdnBXQoYP0QbSU2q0vFERak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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