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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4c666cccc12417b7c6d3e71173802d150388f8dae664b730e04a2edc619d70' 
  AND token = 'KswZQzLtP7A1tvjhRb6KbWnZfs7/tlqkJdG5hxWgZZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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