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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625aa92d75123b45a9886ef179122392d88cbee33dde93142eafe5cf2c3960eb' 
  AND token = 'Nf51eagbMmsMlijoBEbX4SDi9H3lI7hWa0UIubkmEss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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