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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab90594d44f18e710b9e7adf11ae0b6fcd2ea5fea3c81c5b30ed645024f9c67' 
  AND token = 'dsWvk4eI5XsTXRwOImWfMUztqKy8FTVrgkx3yRfCwco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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